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Question
An aeroplane is 30m long and its model is l5 cm long. If the total outer surface area of the model is 150 cm2 , find the cost of painting the outer surface of the aeroplane at Rs. 120 per m2, if 5O m2 is left out for windows.
Solution
15 cm represents = 30m
1 cm represents `30/15` = 2 m
1 cm2 represents 2m x 2m = 4 m2
Surface area of the model = 150cm2
Actual surface area of aeroplane = 150 x 2 x 2 m2 = 600 m2
50 m2 is left out for windows
Area to be painted = 600 - 50 = 50 m2
Cost of painting per m2 = Rs. 120
Cost of painting 550 m2 = 120 x 550 = Rs 66000
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